diff --git a/Project.toml b/Project.toml
index 741d172..0047d7d 100644
--- a/Project.toml
+++ b/Project.toml
@@ -27,7 +27,7 @@ Contour = "0.6"
 EFIT = "1"
 ForwardDiff = "0.10"
 HCubature = "1"
-Interpolations = "0.14.7"
+Interpolations = "0.14.7, 0.15"
 LRUCache = "1"
 Memoize = "0.4"
 NetCDF = "0.12"